ipsec: fix esp trace seq number overflow

Do not copy invalid seq number if packet is too small.

Type: fix

Change-Id: I1e78f5920e9645521f57efccaf35bbf9ce0676a8
Signed-off-by: Benoît Ganne <bganne@cisco.com>
(cherry picked from commit c520fe7ab9db6fa60f9e69be990dd5c83eb40522)

2 files changed, 12 insertions, 4 deletions

diff --git a/src/vnet/ipsec/ipsec_if_in.c b/src/vnet/ipsec/ipsec_if_in.c
index f9341d62a68..974227f7a0e 100644
--- a/src/vnet/ipsec/ipsec_if_in.c
+++ b/src/vnet/ipsec/ipsec_if_in.c
@@ -457,7 +457,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      else
 		clib_memcpy (&tr->key4, &key40, sizeof (tr->key4));
 	      tr->is_ip6 = is_ip6;
-	      tr->seq = clib_host_to_net_u32 (esp0->seq);
+	      tr->seq =
+		len0 >=
+		sizeof (*esp0) ? clib_host_to_net_u32 (esp0->seq) : ~0;
 	    }
 	  if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
 	    {
@@ -468,7 +470,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      else
 		clib_memcpy (&tr->key4, &key41, sizeof (tr->key4));
 	      tr->is_ip6 = is_ip6;
-	      tr->seq = clib_host_to_net_u32 (esp1->seq);
+	      tr->seq =
+		len1 >=
+		sizeof (*esp1) ? clib_host_to_net_u32 (esp1->seq) : ~0;
 	    }
 	}
 
@@ -641,7 +645,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      else
 		clib_memcpy (&tr->key4, &key40, sizeof (tr->key4));
 	      tr->is_ip6 = is_ip6;
-	      tr->seq = clib_host_to_net_u32 (esp0->seq);
+	      tr->seq =
+		len0 >=
+		sizeof (*esp0) ? clib_host_to_net_u32 (esp0->seq) : ~0;
 	    }
 	}
 
diff --git a/src/vnet/ipsec/ipsec_tun_in.c b/src/vnet/ipsec/ipsec_tun_in.c
index 04f7a9296ab..d88cc08ddbd 100644
--- a/src/vnet/ipsec/ipsec_tun_in.c
+++ b/src/vnet/ipsec/ipsec_tun_in.c
@@ -376,7 +376,9 @@ ipsec_tun_protect_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      else
 		clib_memcpy (&tr->key4, &key40, sizeof (tr->key4));
 	      tr->is_ip6 = is_ip6;
-	      tr->seq = clib_host_to_net_u32 (esp0->seq);
+	      tr->seq =
+		len0 >=
+		sizeof (*esp0) ? clib_host_to_net_u32 (esp0->seq) : ~0;
 	    }
 	}